.app {
  padding: 10px;
  border: 1px solid #000;
}

.node {
  padding: 5px;
  margin-bottom: 10px;
  border: 1px solid red;
  color: red;
}

.sub-node {
  padding: 5px;
  border: 1px solid green;
  color: green;
}

.child {
  padding: 5px;
  border: 1px solid skyblue;
  color: skyblue;
  font-weight: bold;
}
